refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/ethers/src.ts/transaction/address.ts

@@ -0,0 +1,28 @@
+import { getAddress } from "../address/index.js";
+import { keccak256, SigningKey } from "../crypto/index.js";
+
+import type { SignatureLike } from "../crypto/index.js";
+import type { BytesLike } from "../utils/index.js";
+
+/**
+ *  Returns the address for the %%key%%.
+ *
+ *  The key may be any standard form of public key or a private key.
+ */
+export function computeAddress(key: string | SigningKey): string {
+    let pubkey: string;
+    if (typeof(key) === "string") {
+        pubkey = SigningKey.computePublicKey(key, false);
+    } else {
+        pubkey = key.publicKey;
+    }
+    return getAddress(keccak256("0x" + pubkey.substring(4)).substring(26));
+}
+
+/**
+ *  Returns the recovered address for the private key that was
+ *  used to sign %%digest%% that resulted in %%signature%%.
+ */
+export function recoverAddress(digest: BytesLike, signature: SignatureLike): string {
+    return computeAddress(SigningKey.recoverPublicKey(digest, signature));
+}